Using a config file

[szg251]

I think our PABConfig got a bit bloated with a lot of options that don't necessarily need to be changed.
I would propose a yaml configuration file, but i am open to other options.

[samuelWilliams99]

I quite like this package
https://hackage.haskell.org/package/config-value-0.8.2/docs/Config.html

[samuelWilliams99]

We should keep both options available though, as sometimes the config needs to be derived from something.

[samuelWilliams99]

Didn't meant to click close there!

[ryukzak]

Config file format options (mostly from my experience):

• yaml -- good for programmers, but horrible for normal people who can use ms notebook, can't distinguish spaces and tabs, don't believe in space meaning.
• dhall -- high customizable configuration files with embedded template language, as I can see popular in Haskell community, but is overkill for our task and hard to use by normal people.
• edn -- default config format for clojure, looks good and easy to edit but has too unusual syntax for normal people/admins.
• A custom format (including what Sam mentioned above) can raise tooling problems. Usage in non-Haskell projects requires parser rewriting, which is not familiar for unix admins.
• toml -- extension for ini files, so it is a simple and familiar syntax for users.

In conclusion, I would like to try toml, but it is tricky to work with ADT. So I will make a few experiments.

[mikekeke]

Closed by #91